GridBag radio button elements

What should I look at when trying to add another radio button to a panel in a GridBag layout? The screen is not allowed to grow; and, as it is now, adding another radio button causes vital information to disappear off the bottom of the screen.

I'm faced with a redesign of the entire window or causing these radio buttons to be closer together vertically. The Insets currently are (0,0,0,0) .